US9203284B2 - Rotor cooling structures - Google Patents
Rotor cooling structures Download PDFInfo
- Publication number
- US9203284B2 US9203284B2 US13/372,887 US201213372887A US9203284B2 US 9203284 B2 US9203284 B2 US 9203284B2 US 201213372887 A US201213372887 A US 201213372887A US 9203284 B2 US9203284 B2 US 9203284B2
- Authority
- US
- United States
- Prior art keywords
- core
- axial
- rotor
- flow rate
- axial side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/52—Fastening salient pole windings or connections thereto
- H02K3/527—Fastening salient pole windings or connections thereto applicable to rotors only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
- H02K2203/12—Machines characterised by the bobbins for supporting the windings
Definitions
- This disclosure relates to rotors used in electric machines.
- a stator is the stationary part of an electric machine.
- the stator interacts with a rotor, which is the moving or rotating part of the electric machine.
- the stator and rotor allow the electric machine to convert mechanical energy to electrical energy (generator mode) and to convert electrical energy to mechanical energy (motor mode).
- a rotor is provided and defines an axial direction and a radial direction relative to an axis of rotation.
- the rotor includes an annular hub and a core disposed radially outward of the annular hub.
- the core defines a first axial side and a second axial side.
- a plurality of first radial feed holes are formed in the annular hub.
- the first radial feed holes are located between the first axial side and the second axial side of the core.
- a plurality of axial channels are formed between the core and the annular hub. These axial channels are in fluid communication with the first radial feed holes and span substantially between the first axial side and the second axial side.
- the rotor also includes a first member adjacent to the first axial side of the core, and a second member adjacent to the second axial side of the core.
- a plurality of first apertures are formed in the first member, and each of the first apertures is in fluid communication with one of the axial channels.
- a plurality of second apertures are formed in the second member, and each of the second apertures is in fluid communication with one of the axial channels.
- FIG. 1 is a schematic, isometric view of a wound rotor
- FIG. 2 is a schematic, cross-sectional view of the rotor shown in FIG. 1 taken along line 2 - 2 ;
- FIG. 3 is a schematic, isometric view of the rotor shown in FIG. 1 , shown with a core hidden from view to better illustrate a first support ring and a second support ring;
- FIG. 4 is a schematic, isometric view of the core of the rotor shown in FIG. 1 ;
- FIG. 5 is a schematic, isometric view of the second support ring of the rotor shown in FIG. 1 ;
- FIG. 6 is a schematic, isometric view of the first support ring of the rotor shown in FIG. 1 .
- FIG. 1 and FIG. 2 two schematic views of a rotor 10 , which may be used in an electric machine (not shown).
- the rotor 10 shown in FIGS. 1 and 2 is an internal, wound rotor, which cooperates with an external stator (not shown) in the electric machine.
- FIG. 1 shows an isometric view of the rotor 10 , substantially assembled.
- FIG. 2 shows a cross section of the rotor 10 , taken along line 2 - 2 of FIG. 1 .
- Features and components shown in other figures may be incorporated and used with those shown in FIG. 1 and FIG. 2 , and components may be mixed and matched between any of the configurations shown.
- the rotor 10 includes a hub 12 and a core 14 , which has a plurality of rotor teeth 16 .
- the core 14 is disposed radially outward of the hub 12 , relative to an axis 18 of the rotor 10 .
- the core 14 shown is formed as a solid, one-piece core, but may alternatively be formed as a segmented core or as a laminated (axially-layered) core, and may be formed of powdered metal, cast, or machined.
- the rotor 10 rotates about the axis 18 during operation of the electric machine.
- the stator of the electric machine would share substantially the same axis 18 .
- the rotor 10 also defines a radial direction, which extends perpendicularly outward from the axis 18 , and an angular axis or a tangential axis, which is in the direction of rotation about the radial direction.
- the rotor 10 may also use Cartesian coordinates, with the axis 18 being the z-axis, and also defining an x-axis (not shown) and a y-axis (not shown), both of which are perpendicular to the axis 18 .
- the rotor 10 includes a plurality of windings 20 that are wrapped around the rotor teeth 16 , and extend axially beyond the core.
- the windings 20 are shown as a single block of material, but may be formed from wires or bar conductors that are then looped or twisted around the rotor teeth 16 .
- FIG. 3 shows another isometric view of portions of the rotor 10 .
- the core 14 and the windings 20 are hidden from view to better illustrate a first support ring 31 and a second support ring 32 of the rotor 10 , which are described in more detail herein.
- FIG. 4 shows an isometric view of only the core 14 .
- FIG. 5 shows an isometric view of the first support ring 31 .
- FIG. 6 shows an isometric view of the second support ring 32 .
- the rotor 10 also includes a plurality of bobbin segments or bobbins 22 , each of which substantially surrounds one of the rotor teeth 16 .
- the bobbins 22 may provide an insulating layer between the windings 20 and the rotor teeth 16 .
- the bobbins 22 may also provide structural support for the windings.
- the core 14 also the remainder of the rotor 10 , defines a first axial side 25 and a second axial side 26 of the rotor teeth 16 .
- Relative sides or axial directions of the rotor 10 and the hub 16 may also be identified by the first axial side 25 and the second axial side 26 .
- Designation as first or second may occur in any order and is not limiting of any specific component.
- the bobbin rings 22 are between the windings 20 and the rotor teeth 16 on the first axial side 25 and the second axial side 26 of the core 14 .
- an annular shelf 28 extends radially outward from the hub 12 .
- the rotor 10 includes the first support ring 31 and the second support ring 32 . As shown in FIG. 3 , the first support ring 31 and the second support ring 32 are disposed on opposite sides of the core 14 , axially. The first support ring 31 and the second support ring 32 are in contact with at least the hub 12 , and may also be in contact with the core 14 and the bobbins 22 , as shown in FIG. 2 .
- the first support ring 31 includes an annular base or first disc 33 and the second support ring 32 includes a second disc 34 or annular base.
- the first disc 33 and the second disc 34 are in contact with the hub 12 and are configured to transfer loads from the first support ring 31 and the second support ring 32 to the hub 12 .
- a plurality of first fingers 35 extend radially outward from the first disc 33
- a plurality of second fingers 36 extend radially outward from the second disc 34 .
- each of the first fingers 35 corresponds to one of the windings 20 and is generally aligned with one of the rotor teeth 16 .
- each of the second fingers 36 corresponds to one of the windings 20 .
- the first support ring 31 and the second support ring 32 are not identical but do share many similar features.
- a plurality of first loaded edges 37 extend axially from the first fingers 35 of the first support ring 31 .
- the first loaded edges 37 are disposed radially outward of the windings 20 , such that radial loads from the windings 20 are transferred—at least partially—to the load edges 37 of the first support ring 31 .
- a plurality of second loaded edges 38 extend axially from the second fingers 36 and are disposed radially outward of the windings 20 , such that radial loads from the windings 20 are transferred—at least partially—to the load edges 38 of the second support ring 32 .
- the first loaded edges 37 and second loaded edges 38 are cantilevered from the first fingers 35 and the second fingers 36 , respectively, in the configuration of the rotor 10 shown. However, other shapes may be used to allow transfer of radial loads from the windings 20 to the first support ring 31 and the second support ring 32 and, therefore, to the hub 12 .
- the first loaded edges 37 and second loaded edges 38 may also be formed with a rounded or hooked shape (i.e., similar to a shepherd's hook or a candy cane) extending from the first fingers 35 and the second fingers 36 , respectively. Additionally, the first loaded edges 37 and second loaded edges 38 need not be identical.
- Radial loads are transferred from the windings 20 to the bobbins 22 . Without the first support ring 31 and the second support ring 32 , all of the radial loads from the winding 20 would be transferred to the rotor teeth 16 and the core 14 —possibly through the bobbins 22 as an intermediary. However, the first support ring 31 and the second support ring 32 absorb or react some of the radial loads from the windings 20 . This configuration reduces and distributes the loads transferred to the bobbins 22 and the rotor teeth 16 of the core 14 .
- the first fingers 35 are disposed between the windings 20 and the first axial side 25 of the rotor teeth 16
- the second fingers 36 are disposed between the windings 20 and the second axial side 26 of the rotor teeth 16
- the bobbins 22 are disposed between the windings 20 and the first and second fingers 35 , 36 . Therefore, radial loads from the windings 20 are transferred first to the bobbins 22 and then to the first and second fingers 35 , 36 .
- the first support ring 31 may be formed as a unitary component, such that the first disc 33 , the first fingers 35 , and the first loaded edges 37 are formed as one piece. Furthermore, the first support ring 31 may be a stamped component. Similarly, the second support ring 32 may be stamped as a unitary component, such that the second disc 34 , the second fingers 36 , and the second loaded edges 38 are formed as a one-piece stamping.
- the first support ring 31 and the second support ring 32 may be formed from substantially-nonmagnetic materials. If the first support ring 31 and the second support ring 32 are substantially nonmagnetic, the first support ring 31 and the second support ring 32 may not alter the magnetic response of the windings 20 during operation of the rotor 10 in the electric machine.
- the bobbins 22 may also be formed from nonmagnetic or insulating materials. For example, and without limitation, the bobbins 22 may be formed from resin and the first support ring 31 and the second support ring 32 may be formed from stainless steel.
- the second support ring 32 may be press-fit onto the hub 12 . Therefore, the first support ring 31 is trapped between the annular shelf 28 and the first axial side 25 of the core 14 . Then the second support ring 32 is press-fit onto the hub 12 , such that the second support ring 32 traps the core 14 and the first support ring 31 against the annular shelf 28 of the hub 12 .
- the rotor 10 also includes structures to control the flow of cooling fluids through the rotor 10 .
- the rotor 10 may be cooled by different fluids.
- Some fluids that may be used include, without limitation, automatic transmission fluid (ATF) or oil.
- cooling fluid is generally forced radially outward from the axis 18 .
- the cooling fluid may be supplied radially inward of the hub 12 .
- a plurality of first radial feed holes 41 are formed in the annular hub 12 .
- the first radial feed holes 41 allow fluid to flow radially through (from inside to outside) the hub 12 .
- the first radial feed holes 41 are located between the first axial side 25 and the second axial side 26 of the core 14 .
- a plurality of axial channels 44 are formed between the core 14 and the annular hub 12 .
- the axial channels 44 are formed on the interior of the core 14 .
- the axial channels 44 may also be formed on the exterior of the hub 12 .
- the axial channels 44 are in fluid communication with the first radial feed holes 41 and span substantially between the first axial side 25 and the second axial side 26 of the core 14 . Therefore, the axial channels 44 distribute cooling fluid supplied by the first axial feed holes 41 to both sides of the rotor 10 .
- the axial channels 44 distribute cooling fluid supplied by both the first axial feed holes 41 and the second axial feed holes 42 to both sides of the rotor 10 .
- first member such as the first support ring 31
- second member such as the second support ring 32
- a plurality of first apertures 45 are formed in the first support ring 31 . Each of the first apertures 45 are in fluid communication with one of the axial channels 44 . Furthermore, a plurality of second apertures 46 are formed in the second support ring 32 . Each of the second apertures 46 are in fluid communication with one of the axial channels 44 .
- the cooling fluid passes through the first axial feed holes 41 and the second axial feed holes 42 to both sides of the rotor 10 via the axial channels 44 . Then, the first apertures 45 and the second apertures 46 allow cooling fluid to be communicated to the windings 20 of the rotor 10 . Cooling the windings 20 may improve the performance and durability of the rotor 10 .
- the rotor 10 may have conductive structures, such as bars, instead of the windings 20 .
- the cooling fluid may be similarly passed to both the first axial side 25 and the second axial side 26 of the core 14 , but will be used to cool the other conductive elements.
- permanent magnets used in internal permanent magnets rotors may be cooled by the directed routing of cooling fluid from the hub 12 to both sides of the core 14 .
- the second radial feed holes 42 may be sized to have significantly greater flow rates than the first radial feed holes 41 , which may result in imbalances of cooling fluid being communicated to the second axial side 26 .
- tuning the size and shape of the first apertures 45 and the second aperture 46 may allow fluid flow to be biased towards the first axial side 25 , the second axial side 26 , or balanced between both sides. Tuning may be used to control which side the majority of the fluid comes from. Greater flows of cooling fluid to windings 20 adjacent the second axial side 26 may cause that side of the windings 20 to be significantly lower in temperature than the windings 20 adjacent the first axial side 25 .
- the first apertures 45 may be sized to allow a first flow rate to the first axial side 25 of the rotor 10
- the second apertures 46 may be sized to allow a second flow rate to the second axial side 26 of the rotor 10 .
- the total of the first flow rate and the second flow rate is a combined flow rate, which is the total flow rate from the first radial feed holes 41 and the second radial feed holes 42 through the axial channels 44 .
- the size and shape of the first apertures 45 and the second apertures 46 may be tuned such that the first flow rate and the second flow rate are different or such that the first flow rate and the second flow rate are substantially equal, regardless of whether there are different flow rates from the first radial feed holes 41 and the second radial feed holes 42 .
- the first apertures 45 and the second apertures 46 may be tuned to minimize imbalances, such that neither flow rate is greater than seventy percent of the combined flow rate.
- the first apertures 45 and the second apertures 46 may be tuned for balanced flow rates, such that neither flow rate is greater than sixty percent of the combined flow rate.
- the rotor 10 may be configured for fully-balanced flow, such that the flow rates are substantially equal.
- the second apertures 46 may be sized to restrict the second flow rate relative to the first flow rate of the first apertures 45 . Restricting the second flow rate may cause pressure to build in the axial channels 44 and to increase the first flow rate to the first axial side 25 . Therefore, even with the second axial feed holes 42 providing eighty percent of the cooling fluid to the axial channels 44 , the second flow rate through the second apertures 46 may be between fifty to sixty percent of the combined flow rate, such that each side of the rotor 10 receives similar cooling fluid flow.
- the rotor 10 may also include a plurality of third apertures 48 . Unlike the first apertures 45 and the second apertures 46 , which are formed in the first support ring 31 and the second support ring 32 , the third apertures 48 are formed in the annular hub 12 . The third apertures 48 are formed adjacent to the first apertures 45 of the first support ring 31 and, if present, affect the first flow rate to the first axial side.
- each of the axial channels 44 may correspond to one of the rotor teeth 16 .
- the axial channels 44 may be on the inner diameter of the core 14 , circumferentially centered under individual rotor teeth 16 .
- the axial channels 44 may be formed on the outer diameter of the hub 12 , adjacent to the core 14 . In configurations without rotor teeth 16 , there may be additional or fewer axial channels 44 relative to the conductors (and relative to each of the magnetic poles).
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims (8)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/372,887 US9203284B2 (en) | 2012-02-14 | 2012-02-14 | Rotor cooling structures |
CN2013100454688A CN103248157A (en) | 2012-02-14 | 2013-02-05 | Rotor cooling structure |
DE102013202169A DE102013202169A1 (en) | 2012-02-14 | 2013-02-11 | Structures for rotor cooling |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/372,887 US9203284B2 (en) | 2012-02-14 | 2012-02-14 | Rotor cooling structures |
Publications (2)
Publication Number | Publication Date |
---|---|
US20130207493A1 US20130207493A1 (en) | 2013-08-15 |
US9203284B2 true US9203284B2 (en) | 2015-12-01 |
Family
ID=48868472
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/372,887 Active 2034-04-17 US9203284B2 (en) | 2012-02-14 | 2012-02-14 | Rotor cooling structures |
Country Status (3)
Country | Link |
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US (1) | US9203284B2 (en) |
CN (1) | CN103248157A (en) |
DE (1) | DE102013202169A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160204663A1 (en) * | 2013-09-06 | 2016-07-14 | Ge Aviation Systems Llc | Rotor assembly for an electric machine |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101664047B1 (en) * | 2014-12-03 | 2016-10-10 | 현대자동차 주식회사 | Rotor structure of wrsm motor |
KR101683494B1 (en) * | 2014-12-03 | 2016-12-07 | 현대자동차 주식회사 | Rotor structure of wrsm motor |
US10476332B2 (en) * | 2016-12-21 | 2019-11-12 | Siemens Industry, Inc. | Rotor assembly and electrodynamic machine with axial vents for heat transfer |
Citations (15)
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US5994804A (en) * | 1998-12-07 | 1999-11-30 | Sundstrand Corporation | Air cooled dynamoelectric machine |
US6323567B1 (en) * | 1999-12-24 | 2001-11-27 | Nikon Corporation | Circulating system for shaft-type linear motors |
US20030030333A1 (en) * | 2001-08-08 | 2003-02-13 | Johnsen Tyrone A. | Cooling of a rotor for a rotary electric machine |
US20040080218A1 (en) * | 2000-06-21 | 2004-04-29 | Bae Systems Controls Inc. | Rotating machine with cooled hollow rotor bars |
JP2004282902A (en) | 2003-03-14 | 2004-10-07 | Toyota Motor Corp | Rotary electric machine |
JP2005006428A (en) | 2003-06-12 | 2005-01-06 | Toyota Motor Corp | Rotor structure of rotating electric machine |
US20050012403A1 (en) * | 2003-07-15 | 2005-01-20 | Michael Binnard | Dual flow circulation system for a mover |
US6982506B1 (en) * | 2004-08-31 | 2006-01-03 | Hamilton Sundstrand Corporation | Cooling of high speed electromagnetic rotor with fixed terminals |
US20070200441A1 (en) * | 2006-02-27 | 2007-08-30 | El-Antably Ahmed M | Cooling system for a stator assembly |
US7411323B2 (en) * | 2003-04-16 | 2008-08-12 | Siemens Aktiengesellschaft | Electrical machine having cooled laminated stator and rotor cores and windings |
US7514827B2 (en) * | 2005-10-01 | 2009-04-07 | Turbo Power Systems Limited | Self-cooled rotor for an electrical machine |
US7598635B2 (en) * | 2005-11-29 | 2009-10-06 | Goodrich Control Systems Limited | Dynamo electric machine |
WO2010128632A1 (en) | 2009-05-07 | 2010-11-11 | Ntn株式会社 | Cooling structure for motors |
US7994668B2 (en) * | 2009-05-18 | 2011-08-09 | General Electric Company | Cooling system for rotating machine |
US8080908B2 (en) * | 2005-11-09 | 2011-12-20 | Kabushiki Kaisha Toshiba | Cooling structure for rotor core in electric rotating machine |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2010239799A (en) * | 2009-03-31 | 2010-10-21 | Aisin Aw Co Ltd | Rotating electric machine and end plate for rotating electric machine |
-
2012
- 2012-02-14 US US13/372,887 patent/US9203284B2/en active Active
-
2013
- 2013-02-05 CN CN2013100454688A patent/CN103248157A/en active Pending
- 2013-02-11 DE DE102013202169A patent/DE102013202169A1/en active Pending
Patent Citations (18)
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US5994804A (en) * | 1998-12-07 | 1999-11-30 | Sundstrand Corporation | Air cooled dynamoelectric machine |
US6323567B1 (en) * | 1999-12-24 | 2001-11-27 | Nikon Corporation | Circulating system for shaft-type linear motors |
US6879069B1 (en) * | 2000-06-21 | 2005-04-12 | Bae Systems Controls Inc. | Rotating machine with cooled hollow rotor bars |
US20040080218A1 (en) * | 2000-06-21 | 2004-04-29 | Bae Systems Controls Inc. | Rotating machine with cooled hollow rotor bars |
US20030030333A1 (en) * | 2001-08-08 | 2003-02-13 | Johnsen Tyrone A. | Cooling of a rotor for a rotary electric machine |
US6727609B2 (en) * | 2001-08-08 | 2004-04-27 | Hamilton Sundstrand Corporation | Cooling of a rotor for a rotary electric machine |
JP2004282902A (en) | 2003-03-14 | 2004-10-07 | Toyota Motor Corp | Rotary electric machine |
US7411323B2 (en) * | 2003-04-16 | 2008-08-12 | Siemens Aktiengesellschaft | Electrical machine having cooled laminated stator and rotor cores and windings |
JP2005006428A (en) | 2003-06-12 | 2005-01-06 | Toyota Motor Corp | Rotor structure of rotating electric machine |
US20060001322A1 (en) * | 2003-07-15 | 2006-01-05 | Michael Binnard | Dual flow circulation system for a mover |
US20050012403A1 (en) * | 2003-07-15 | 2005-01-20 | Michael Binnard | Dual flow circulation system for a mover |
US6982506B1 (en) * | 2004-08-31 | 2006-01-03 | Hamilton Sundstrand Corporation | Cooling of high speed electromagnetic rotor with fixed terminals |
US7514827B2 (en) * | 2005-10-01 | 2009-04-07 | Turbo Power Systems Limited | Self-cooled rotor for an electrical machine |
US8080908B2 (en) * | 2005-11-09 | 2011-12-20 | Kabushiki Kaisha Toshiba | Cooling structure for rotor core in electric rotating machine |
US7598635B2 (en) * | 2005-11-29 | 2009-10-06 | Goodrich Control Systems Limited | Dynamo electric machine |
US20070200441A1 (en) * | 2006-02-27 | 2007-08-30 | El-Antably Ahmed M | Cooling system for a stator assembly |
WO2010128632A1 (en) | 2009-05-07 | 2010-11-11 | Ntn株式会社 | Cooling structure for motors |
US7994668B2 (en) * | 2009-05-18 | 2011-08-09 | General Electric Company | Cooling system for rotating machine |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160204663A1 (en) * | 2013-09-06 | 2016-07-14 | Ge Aviation Systems Llc | Rotor assembly for an electric machine |
US20160285332A1 (en) * | 2013-09-06 | 2016-09-29 | Ge Aviation Systems Llc | Rotor assembly for an electric machine |
US10523079B2 (en) * | 2013-09-06 | 2019-12-31 | Ge Aviation Systems Llc | Rotor assembly for an electric machine with thermal management features |
US10554088B2 (en) * | 2013-09-06 | 2020-02-04 | Ge Aviation Systems Llc | Rotor assembly for an electric machine having a coolant passage |
Also Published As
Publication number | Publication date |
---|---|
US20130207493A1 (en) | 2013-08-15 |
DE102013202169A1 (en) | 2013-08-14 |
CN103248157A (en) | 2013-08-14 |
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